Process of making compound rods or wires.



. perature. The jacket and core are then re- UNITED STATES PATENT OFFICE.

EDUABD SGH'URHOFF, 0F WEISSENSEE, NEAR BERLIN, GERMANY.

. No Drawing.

To all whom it may concern Be it known that I, EDUARD SoHi'JRHoFr, engineer, citizen of the German Empire, residing at Weissensee, near Berlin, Germany,

5 have invented certain new and useful Improvements in'the Process of Making Compound Rods or Wires, of which the following is a specification.

The present invention is a process for producing rod shaped bodies, particularly wires of rolled stock consistin ing and of a comparatlvely fusible metal. By preference, the tubular jacket or outer cover of such bodies consists of the slowly melting metal and the core or inner part is composed of the more fusible metal.

The process in its preferred embodiment consists in first heating the tubular jacket in a heating furnace approximately to its melting temperature, after which the core is introduced in a cool state into the jacket while the latter is in the heating furnace,

and then both jacket and core are allowed to remalnin the furnace until the outer zone of the core has reached the melting temmoved from the'furnace and subjected in a known manner to a rolling operation for the purpose of welding the two metal bodies together.

The present process is particularly adapted for the production of wires consisting of an outer layer or jacket of copper and an inner core or filling of aluminium. To this of aluminium are 'roduced. The copper tube is first placed in a heating furnace which is heated u to 1000 C., and after being brought to t is temperature is left in the furnace in which the temperature is uniformly maintained. The aluminium core without previous heating is then forced into the copper tube while in the furnace by pressure. After a short time the outer layer of the aluminium core commences to melt, while the interior of the core has a temperature of about 300 C. By subsequently 'rollin the two parts, the two metals are l weld togethen. Since during the heating 69 of the core in the copper tube no air can Specification of Letters Patent.

Application filed March 29, 1912. Serial No. 687,277.

of a slowly melt-' end a copper tube and a corresponding core Patented Nov. 12, 1912.

enter between the jacket and the core, where by oxidation of the contacting surfaces of the two metal bodies is excluded, this welding surfaces between jacket and core is prevented owing'to their union being effected within the furnace. a.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what lrcl'aim is 1. In a process of making compound rods or wires having a 'acket ofslowly melting metal and a core of more fusible metal, the steps which consist in heating a tube of the slowly melting metal to a temperature above the melting point of the core metal, introducing the core in a non-fused state into said tube, maintainin the temperature until fusion ofthe perlpheral portions only of the core occurs, and then welding the core a and. jacket. Y

2. In a process of making compound rods or wires aving a jacket of copper anda core of aluminum, the steps w 1ch consist in heating a tube of copper approximately to its melting point, introducing thereinto asclid aluminum core, maintaining the temperature until fusion of the peripheral portions only of the core occurs, and then weld-. ing the core and jacket.

In testimony whereof, I aflix my signature in presence of two witnesses.

EDUARD SCHURHOFF.

Witnesses WOLDEMAR Hmr r, IIENRY Hasrmt. 

